Description:
------------
I expanded my single memcached server setup to include a pool 
of memcached servers and in the process took a few minutes to 
make a simple status script:

http://esea.net/staff/kane/service_stats.php

The problem is when one server goes down all the operations 
(set, get, etc) continue fine, but getStats returns NULL and 
the result code is Memcached::RES_SOME_ERRORS.

Anyway this could return the normal array of servers, the 
stats for the alive ones, and NULL for any that are down?

Thanks in advance for the help.

Reproduce code:
---------------
$array = array(													array('10.1.1.9', 11211, 25),	// alive
array('10.1.1.13', 11211, 25),	// alive						array('10.1.1.8', 11211, 25),	// alive
array('10.1.1.7', 11211, 25)	// dead
);
$mc->addServers($array);

var_dump($mc->getStats());

Expected result:
----------------
Associative array indexed by host:port with stats for alive 
servers and NULL or some other indication that a server is 
down.

Actual result:
--------------
NULL